8. B'Wana Beast
If you're going to go for a more obscure comic book character, make sure it's not one with a ridiculous costume that makes it look like you've just grabbed whatever left-overs were in the bottom of your mother's wardrobe, no matter what sort of time you put into it, and also not one with questionable, and very possibly racist origins. As a character, B'Wana Beast is a curious creation, with the ability to create weird hybrid creatures out of different animals to combine their "powers" - much like Doctor Moreau, but his costume legitimately sucks from his calf-high boots right up to his leopard print pointy mask (made out of the animals he calls his allies, which mustn't go down too well with the siblings of the leopards he wears on his face.) Even if you're a rippling hunk of a man, it's going to be difficult to pull this off, and chances are, you're going to spend most of the night explaining who you're supposed to be.
7. Robin
Is that an over-sized cod-piece in your pants Robin, or are you just very happy to see us? Oh, right, it actually is an over-sized, and frankly arrogant cod-piece. Very much from the Joel Schumacher school of genital fetishism.